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Upgrading Medium-Frequency Induction Heating Equipment with Thyristor Modules

In a metal manufacturing company, the medium-frequency induction heating equipment used for preheating metal materials before forging began to experience problems after long-term operation, including reduced heating efficiency and unstable temperature control. Under the original heating time settings, the metal billets could no longer reach the required forging temperature, which not only delayed production schedules but also caused inconsistent product quality due to temperature fluctuations. As a result, the defect rate increased significantly.

The company's technical team conducted a comprehensive inspection of the equipment and identified that the problem was mainly caused by the power regulation and control system. The equipment originally used a traditional relay-based control circuit. During frequent switching operations, the relay contacts were prone to wear, resulting in slower circuit response and inaccurate power regulation. In an industrial AC-to-DC front-end, a 3 phase rectifier module can provide the DC conversion stage, while thyristor modules regulate power delivery according to the heating process. This could not meet the requirements of medium-frequency induction heating systems, which require fast and precise power adjustment.

To completely solve this issue, the company decided to upgrade the equipment by adopting thyristor modules. Thyristor modules offer significant advantages, including fast response speed, a wide power adjustment range, and high control accuracy. In AC circuits, they can flexibly regulate output voltage and power by controlling the phase angle of the triggering signal. During installation, the technical team strictly followed the thyristor module installation guidelines and carefully completed wiring connections and parameter adjustments.

After the upgrade was completed and the equipment was put into operation, the performance of the medium-frequency induction heating system improved significantly. Heating efficiency increased substantially. The time required to heat metal billets to the desired forging temperature was greatly reduced, improving production efficiency by approximately 40% compared with the previous system and effectively easing production pressure.

In terms of temperature control, thanks to the precise power regulation provided by the thyristor module, the equipment was able to maintain heating temperatures within a very narrow fluctuation range. The stability of forged product quality improved significantly, and the defect rate decreased from 15% to below 3%. In addition, the contactless switching characteristics of thyristor modules greatly reduced equipment failures, lowering maintenance frequency and operating costs.

The successful application of thyristor modules in medium-frequency induction heating equipment provided strong support for improving production efficiency and ensuring product quality. It also offered valuable experience and a practical reference for similar enterprises seeking equipment upgrades and intelligent control improvements.

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